JP2012519596A - Pressure vessel for high pressure press - Google Patents

Abstract

  The present invention relates to a sealing structure for sealing at least first and second sub-cylinders (4, 6) forming a cylinder body (2) and a joint (3) between both sub-cylinders against leakage of a high-pressure medium And a pressure vessel (1) for a high pressure press. The sealing arrangement comprises a ring shaped sealing band (18) and first and second projecting flanges (30, 32) respectively disposed in the first and second sub-cylinders. The sealing band is positioned concentrically in both projecting flanges so that it can be prestressed in the radial direction at the mounting position, so as to abut against both projecting flanges and seal the joint between both sub cylinders ing. The sealing structure is disposed on the inner wall of the second sub-cylinder to facilitate replacement of its components, and extends in the axial direction away from the second sub-cylinder from the first projecting flange. 1 has a peripheral mounting space (51).

Description

  The present invention relates to a high-pressure press having a first sub-cylinder and a second sub-cylinder connected to each other in the axial direction and sealed by a sealing structure. The invention further relates to a method for replacing the components of the sealing structure.

  During the high pressure press forming operation of the high pressure press, the pressure medium is pressurized to a very high pressure. The pressure medium is a fluid. High pressure presses can be used in a variety of applications. A high-pressure press can be used to shape a sheet-like metal piece into a predetermined shape, for example by significantly pressurizing a given fluid in a closed pressure vessel, exerting pressure on an intermediate diaphragm, etc. To use. If the high pressure press exerts equal pressure on all sides of the contents in the pressure vessel, the press is called an isostatic press. Hydrostatic presses can be used for the compression or densification of metal or ceramic powders, for the reduction of pores or voids in cast or sintered articles, for the sterilization and storage of food, etc. it can. During the process of isostatic pressing, depending on the temperature of the pressure medium, the process can be hot isostatic pressing (HIP), warm isostatic pressing or cold isostatic pressing (CIP). Can be called.

  A pressure vessel of a normal high-pressure press has a cylinder body. The cylinder body is closed by closing lids at both ends of the cylinder. A framework is arranged to hold closed lids at both ends of the cylinder body.

  In order to increase the ability of the pressure vessel to resist crack formation and propagation, the pressure vessel is typically pre-stressed. The container can be prestressed, for example, by autofrettage, by contraction, or by wire winding.

  The level of pressure in the pressure vessel depends on the type of press and the material being pressed. When forming a sheet metal, the press is typically set to a pressure of up to 140 MPa, a pressure of 100 to 600 MPa for CIP, and a pressure of up to 300 MPa for HIP.

  High pressure press cylinders are conventionally manufactured by forging. The cylinder body is first cast and then forged to form the cylinder body. After heat treatment, the cylinder body is machined to its final shape and dimensions. In order to produce very large cylinders, high pressure is required in the equipment for forging, heat treatment and machining processes.

  Recently, there has been an increasing need for pressed articles of larger sizes, which implies the need for larger presses. One way to form a relatively large press is to produce a pressure vessel with a cylinder body having a plurality of sub-cylinders connected to each other. The cylinder body can have a plurality of sub-cylinders arranged so as to be connected to each other, whereby the dimensions (total length in the axial direction) of the cylinder body of the hydrostatic press are one unit. It is not limited by the manufacturing process of one large cylinder.

  Large presses not only benefit from a cylinder body with multiple sub-cylinders connected to each other. A relatively small size pressure vessel provides a relatively short transport time for this structure.

  The problem with this high pressure vessel divided in the axial direction is a sufficient seal of the joint between the sub-cylinders. Pressure medium leakage can cause corrosion or difficulties with reaching and maintaining the desired high pressure. The leakage of the pressure medium to the joint should be stopped, and the leaked pressure medium can transmit a considerable separating force to the sub-cylinders, which can damage the connection between the sub-cylinders, Or even sub-cylinder separation can be guided.

  Another problem with high pressure press sealing structures is that they are subject to wear and are difficult to replace.

  Accordingly, an object of the present invention is to alleviate at least some of the problems described above.

  This object is achieved by a pressure vessel having the features according to the appended claims 1 and 17. Further embodiments are defined in the dependent claims 2 to 16.

  A pressure vessel for a high-pressure press according to the present invention includes at least a first sub-cylinder and a second sub-cylinder connected to each other in an axial direction to form a cylinder body that accommodates a high-pressure medium, and the high-pressure medium. A sealing arrangement disposed on an inner wall of the cylinder body for sealing a joint between the first sub-cylinder and the second sub-cylinder against leakage. The sealing structure is disposed in contact with a ring-shaped sealing band and an inner wall of the first sub-cylinder, and extends in an axial direction from the joint so as to be separated from the second sub-cylinder. A first peripheral protrusion flange and a second peripheral protrusion that is disposed in contact with the inner wall of the second sub-cylinder and extends axially away from the first sub-cylinder from the joint. And a flange. The sealing band is in contact with the first and second projecting flanges so as to be prestressed in the radial direction at the mounting position, and the first sub-cylinder and the second sub-cylinder The sealing band is positioned concentrically within the first and second protruding flanges so as to overlap to seal the joint between. The sealing structure is further disposed on the inner wall of the first sub-cylinder to facilitate replacement of components of the sealing structure and from the first projecting flange to the second A first peripheral mounting space extending axially away from the sub-cylinder.

The method for replacing a worn sealing band of a pressure vessel as described above according to the present invention is as follows:
Removing the worn sealing band from the pressure vessel;
A tool having a wedge-shaped surface is inserted into the first mounting space, so that the wedge-shaped surface is radially inward of the bottom of the first mounting space and the first projecting flange. Inserting a tool having a wedge-shaped surface into the first insertion space so as to form a sliding surface in an axial direction at least at a selected peripheral portion at least along a length between the end portions; When,
Transforming the circular replacement sealing band into an oval shape;
Incorporating the modified replacement sealing band into the pressure vessel;
Placing the modified replacement sealing band in the first mounting space;
Deforming the deformed replacement sealing band so as to return the deformed replacement sealing band to the original circular shape in the first mounting space;
The replacement sealing band is in contact with the first and second projecting flanges so as to be prestressed in a radial direction, and the first sub-cylinder and the second sub-cylinder The replacement sealing band on the wedge-shaped surface of the tool is concentrically pressed into the sealing position within the first and second projecting flanges so as to overlap to seal the joint between A process.

  The sealing band that abuts against the joint in a prestressing manner can achieve the desired contact pressure between the sealing band and the joint, ensuring sufficient sealing against the high pressures in question. is there. The desired contact pressure is provided by a prestressed sealing band supporting the joint so as to try to expand to its original, relaxed state. By selecting the appropriate diameter and thickness of the sealing band and the appropriate radial protrusion of the protruding flange, the desired contact pressure and thus the desired sealing can be achieved.

  With the provision of the first mounting space, it is possible to replace the sealing band according to the present invention with a new sealing band, and the new sealing band supports the joint with a sufficient contact pressure and this contact band. The pressure is applied by prestressing the sealing band. After the worn sealing band has been removed, a new sealing band can be introduced into the pressure vessel, for example by cutting the sealing band. The sealing band is deformed and appropriately rotated so that the outer sealing surface of the sealing band is not damaged by the inner wall of the cylinder body. Then, using the additional space in the mounting space, it is possible to rotate the new sealing band in place so that it is compressed and pressed onto the protruding flange assuming a prestressed mounting position. is there. Thanks to the projecting flange and the mounting space according to the invention, the sealing band only needs to be pressed for a short length of the axial extension of the projecting flange in the state of maximum prestress, This reduces the risk of damaging the outer sealing surface of the sealing band.

  In contrast, in the prior art, the pressure vessel has a cylinder body with flush inner walls, and the sealing is performed during the assembly of the pressure vessel while the pressure vessel is still loose. Given above. The sealing band is prestressed to apply a desired contact pressure to the pressure vessel during the application of the prestressing means, and the sealing band is, for example, a metal band wound around the outer envelope surface of the pressure vessel. is there. In such prior art pressure vessels, for example, when a new sealing band is replaced with an old sealing band when the pressure vessel is prestressed in the radial direction, the outer sealing surface of the sealing band is severely damaged. Without, it is not possible or at least very difficult to place the sealing band in place. This is because the sealing band receives a high compressive force when sliding on the inner wall surface.

  By using a tool having a wedge-shaped surface, the method of the present invention for pressing the sealing band from the mounting space to and over the protruding flange facilitates compression of the sealing band, and the outer sealing surface of the sealing band and The risk of damaging the protruding flange edges or corners is reduced.

  The pressure vessel of the present invention has a cylinder body that is closed at both ends by, for example, a lid. The lid can be arranged so as to be opened and closed when, for example, an object or article to be pressurized in the pressure process of the pressure vessel is inserted into the pressure vessel.

  The cylinder body and lid are usually held in place by a framework. Thus, from the prior art, the cylinder body and lid are held together in the axial direction by the outer frame extending outside the cylinder body from the lid at one end to the lid at the other end. It has been known.

  The cylinder body of the pressure vessel is arranged to hold an article to be high pressure processed. The cylinder body is usually filled with a high pressure medium before the high pressure process begins. The pressure vessel according to the present invention is configured to operate at a high pressure. The pressure level of the pressure vessel of the present invention depends on the type of press and the material being pressed. When forming a sheet metal, the press is typically set to a pressure of up to 140 MPa, a pressure of 100 to 600 MPa for CIP, and a pressure of up to 300 MPa for HIP.

  The high pressure medium is usually a fluid, for example argon gas, oil or water.

  As used herein, a cylinder body generally refers to a tubular body having a generally circular cross section and a cylinder wall.

  For the purposes of this application, the axial direction is the direction along the central axis of the cylinder body. The radial direction is orthogonal to the axial direction and thus is directed radially with respect to the cylinder body. The peripheral extension refers to, for example, a circular extension of the cylinder body along or around the inner surface.

  The cylinder body of the present invention has a plurality of sub cylinders. The sub-cylinder is a cylinder-shaped part. When one sub-cylinder is connected to the other sub-cylinder in the axial direction, a cylinder body having two sub-cylinders is formed. Thus, the present invention is not limited to the use of two sub-cylinders, and the cylinder body can have three, four, five or any other suitable number of sub-cylinders.

  The ring-shaped sealing band of the present invention is made of, for example, a bronze material. The sealing band has a ring shape with an extension in the axial direction. The sealing band is arranged to be radially compressed so that when in the position of the protruding flange, the joint between the protruding flanges is sealed by the sealing band. The outer surface and arrangement of the sealing band is provided with a shape and roughness of the surface configured to provide sealing to the flange. The inner surface and arrangement shape of the sealing band facing the inside of the cylinder body may be any contour shape or surface roughness. The inner arrangement shape is preferably formed such that the space and shape of the cylinder body is substantially the same as the space and shape for a single cylinder.

  The peripheral protruding flange is arranged as a protruding part of the inner cylinder wall. The flange protrudes from the mounting space, so that the inner diameter of the mounting space is larger than the diameter of the flange. The flange is at the periphery and has an axial protrusion so that a plateau is formed on each side of the joint on which the sealing band is abutted. The flanges are preferably arranged symmetrically around the joint, although asymmetric structures are also intended to be part of the present invention.

  The peripheral mounting space of the present invention is disposed on the inner wall of the first sub-cylinder and extends axially away from the first projecting flange and away from the second sub-flange. Arranged to facilitate element exchange. The replacement of the components of the sealing structure includes, for example, replacement of the auxiliary sealing structure and replacement of the sealing band.

  The method for replacing a worn sealing band of the present invention can be applied to replace a sealing band attached to a prestressed pressure vessel. The sealing band need not be worn when being replaced, and the replacement can be done for safety or operational reliability reasons. The sealing band is removed by, for example, cutting, bending, or plastically deforming the sealing band, so that the sealing band can be removed from the pressure vessel without damaging the inner wall of the cylinder body. it can.

  By deforming the circular replacement sealing band into an elliptical shape, contact between the inner surface of the cylinder body and the sealing band can be avoided during insertion of the new sealing band into the cylinder body. Contact between these implies a risk of scratch formation and is a drawback with respect to sealing properties.

  The dimensions, depth and width of the mounting space are set to geometrically engage the new sealing band deformation so that it returns from the elliptical shape to the original, unstressed shape. The mounting space further engages both the tool and the sealing band at the same time, so that a method for replacing the sealing band can be effected. The inner diameter of the mounting space can be further modified to return the new sealing band to its original circular shape when the sealing band is positioned in the mounting space during the method of replacing a worn sealing band. As is the case, the dimensions are set.

  The contact pressure between the sealing band at the mounting position and the protruding flange is the original unstressed diameter, the diameter of the sealing band when mounted in the sealing position against the protruding flange, the material of the sealing band, the arrangement It depends on parameters such as shape, thickness, so that its elasticity is responsive to compressive deformation, the entire area of the interface between the sealing band and the protruding flange. The properties of the sealing band and the contact state are preferably selected such that the sealing band is elastically deformed into its sealing position. Thereby, the sealing properties of the sealing band can be maintained even during cylinder wall movement that may occur during high pressure processes. The level of contact pressure is further tailored after the pressure vessel design and parameters and its high pressure level.

  The mounting space can be formed, for example, by forming a flange inner diameter that is smaller than the inner diameter of the remaining portion of the cylinder. Instead, the rest of the cylinder has the same inner diameter as the flange diameter, and the mounting space is larger in diameter and is embedded in the inner cylinder wall (countersink).

  In one embodiment of the present invention, the sealing band is prestressed in the radial direction by being elastically compressed at the mounting position so that the contact pressure between the sealing band and the protruding flange is at least 2 MPa. As described above, both protruding flanges protrude in the radial direction by a predetermined radial length, and the sealing band has a predetermined outer diameter in a state where no stress is applied. The smaller the size of the pressure vessel, the higher the preferred contact pressure. Accordingly, the contact pressure can be selected and dimensioned by the ratio of the flange protrusion, the material of the sealing band and the change in the outer diameter of the sealing band in the absence of stress.

  In one embodiment of the present invention, the protruding flanges each have a peripheral, sealing contact surface for sealing contact with a corresponding sealing surface of the sealing band. The contact surface extends in the axial direction in parallel with the central axis of the cylinder body. The effect of having a contact surface extending parallel to the central axis of the cylinder body is that the sealing band can be pushed and pulled in the axial direction with equal pressure. Furthermore, during the application of prestress or during the pressure process, the pressure acting on the sealing band is mainly radial and it is difficult to move the sealing band so as to exit axially from its sealing position.

  In one embodiment of the invention, the sealing band is provided with a chamfered edge along at least one of its peripheral flanges. This chamfered edge can be used where a new sealing band according to the method of claim 17 is mounted, the chamfered edge being arranged to slide along the surface of the tool. be able to. A further advantage of having the chamfered edge of the sealing band is that the risk of damage to the sealing band, tool or protruding flange scratches or material is reduced.

  In one embodiment of the invention, the sealing band is made of a metallic material, preferably bronze. The sealing band is preferably not plastically deformed during prestressing or high pressure processes, has a hardness lower than that of the sub-cylinder, and has effective sealing properties.

  In one embodiment of the invention, the first mounting space is such that when the sealing band in the pre-mounted position is positioned in the first mounted position, the sealing band is preferably substantially unstressed. The dimension is set. Sealing bands that are substantially unstressed are effective in replacing worn sealing bands. This is because it is not more difficult to transform an unstressed sealing band into its original circular shape than to transform a stressed sealing band into its original circular shape.

  In one embodiment of the present invention, the sealing band is in the mounting position, and the peripheral sealing channel is between the sealing band, the radial surface of the first projecting flange, and the inner wall of the first sub-cylinder. As formed, it has a peripheral portion extending axially through the first projecting flange and over a portion of the first mounting space. The sealing arrangement further comprises a peripheral auxiliary sealing arrangement which is connected to the sealing channel for sealing the joint between the sealing band and the first protruding flange. Has been placed. The auxiliary sealing structure is advantageous in that the sealing structure and the joint are thereby further sealed. The portion of the sealing band that extends axially through the first projecting flange can further be used as a grip member in the removal of a worn sealing band and in the placement and pressing of the replacement sealing band.

  In one embodiment of the invention, the first mounting space has an axial extension that accesses the sealing channel from within the cylinder body for replacement of at least the components of the auxiliary sealing structure. Thus, the components of the auxiliary sealing structure can be exchanged, while the sealing band remains in the mounting position. The sealing channel can be further inspected with control of cracking through the mounting space, for example by casting with a non-destructive casting material. Alternatively, the sealing channel can be inspected or controlled by the eye, ie visually, by slightly moving the sealing band in the axial direction towards the sealing channel.

  In one embodiment, the auxiliary sealing arrangement has a soft seal, for example an O-ring, a square ring or a U-cup seal. The auxiliary sealing arrangement may instead have multiple soft seals placed in the same sealing channel, and the space between the two soft seals can be a corrosion inhibitor such as grease, for example. Can be used to keep.

  In one embodiment of the present invention, the sealing structure further comprises a locking member disposed in the first mounting space to prevent axial movement of the sealing band in the mounting position. The locking member can also be used as a sliding stop or guide when pressing the sealing band into the sealing position in replacement of the sealing band.

  In an embodiment of the invention, the locking member has a circlip. This circlip is effective in that the locking ring can be easily attached and detached.

  In an embodiment of the present invention, the first mounting space is formed by a peripheral mounting groove on the inner wall of the first sub-cylinder, and the radial thickness of the locking member is determined by the first projecting flange and the sealing band. The locking member extends axially from the periphery of the sealing band to the tip of the mounting groove, thereby allowing the inner surface of the radial direction of the sealing band, the locking member and the outer side of the mounting groove to be equal. The inner surface of the cylinder body is in the same plane. The inner surface in the same plane of the cylinder body is effective in that it is effectively an internal component of the holder of the article or object to be pressure treated. Coplanar inner surfaces are further effective in loading and unloading articles or objects.

  In another embodiment of the invention, the sealing arrangement further comprises a second peripheral mounting space. The second peripheral mounting space is disposed on the inner wall of the second sub-cylinder, extends axially away from the first sub-cylinder from the second protruding flange, and is disposed as the first peripheral mounting space. And cooperating with corresponding features of the sealing structure, such as the first peripheral mounting space. In one embodiment, the sealing structure is symmetric with respect to the joint between the first sub-cylinder and the second sub-cylinder. A symmetrical sealing structure is advantageous in that, for example, an auxiliary sealing structure can be arranged to seal the joint between the sealing band and the second protruding flange. The effect with the features of the asymmetric sealing structure described above can also be applied to a symmetric sealing structure.

  In one embodiment of the present invention, the prestressing means is provided around the envelope surface of the cylinder body, whereby the cylinder body is prestressed in the radial direction. The press stress means can be wire winding or shrinking or other pre-stress means. The prestressing means in the radial direction of the cylinder body is effective in that the ability of the pressure vessel to withstand crack formation and propagation is enhanced.

In one embodiment of the present invention, the first sub-cylinder and the second sub-cylinder are connected in the axial direction by an attachment member,
The first sub-cylinder is provided with a first sheet that receives the first portion of the attachment member,
The second sub-cylinder is provided with a second sheet that receives the second portion of the attachment member,
The attachment member is engaged with the first and second seats,
The attachment member and the first and second seats are relative axial directions of the attachment member and the first and second seats between the first sub-cylinder and the second sub-cylinder. Arranged to work together to prevent the movement of
The prestressing means is provided around the envelope surface of the cylinder body so that the cylinder body is prestressed in the radial direction and the attachment member is locked to the first and second seats. Yes.

  The attachment member of the present invention is arranged to hold, secure, connect or attach the first and second sub-cylinders to prevent axial separation between the sub-cylinders. It is a member.

  With respect to the attachment members arranged on the seats of the first and second sub-cylinders, the attachment members are locked by the prestressing means by preparing the pressure vessel having the first and second sub-cylinders. This can prevent the movement separating in the axial direction. The axial connection between the two sub-cylinders is based on these couplings, while the attachment member and the first and second seats cooperate to prevent separating axial forces. Constructed and arranged, on the other hand, prestressing means are arranged for locking the attachment member to the seat. In addition to maintaining a force that securely absorbs the attachment member in place in the sheet, the prestressing means applies additional force to the mechanical connector (sheet and attachment member). As a result, a reliable connection between the two sub-cylinders can be achieved with the pressure vessel according to the invention.

  The attachment member is preferably positioned to connect the joint between the two sub-cylinders, so that no additional space is required at the cylinder away from the joint. This is advantageous in that the rest of the pressure vessel design does not have to be applied or redesigned from having a homogeneous cylinder body. The number of sub-cylinders connected to each other is not limited, for example, due to lack of connection space, so that the cylinder body can have several sub-cylinders, more than two sub-cylinders connected to each other.

  Ideally, no leakage from the pressure vessel will occur. However, if a leak occurs at the sealing means, the pressure medium will flow out of the cylinder body.

  In one embodiment, the joint between the first sub-cylinder and the second sub-cylinder, in one embodiment, from the sealing structure at the inside of the cylinder body, through the cylinder body and in the radial direction, At least one radial discharge channel is provided that extends to the inlet of the through discharge hole.

  In one embodiment of the present invention, the attachment member includes an inlet at a joint between the first sub-cylinder and the second sub-cylinder that extends radially through the attachment member. Further, at least one discharge through hole is arranged.

  In one embodiment, the discharge channel is disposed in the axial direction of the cylinder body between the cylinder body and the prestressing means. An example of such a structure is a rod disposed around the envelope surface of the cylinder body. The space between the rod and the envelope surface of the cylinder body forms a discharge channel in the axial direction of the cylinder body when the rod is arranged along the outer surface of the cylinder body. The rod can be in the shape of a circular cross section, but is preferably edged, more preferably 6 edges.

  In one embodiment, the cross-sectional area of the discharge hole and the discharge channel is determined by a radial discharge channel, a discharge hole, and an axial discharge channel via a joint between the first sub-cylinder and the second sub-cylinder. And the pressure medium leakage flow leaking from the cylinder body is configured to flow through a path with equal or expanding cross-sectional area. This reduces, for example, the flow resistance in the direction of the discharge flow so that forces acting in the separating direction of the sub-cylinders are avoided.

  The drain arranged in the pressure vessel is effective in that leakage can be observed in the initial stage. Leakage control is important for safety and performance reasons. If a leak is not noticed at an early stage, the risk of damage to the pressure vessel increases.

  In general, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein.

  Other objects, features and advantages of the present invention will become apparent from the following detailed description, the appended dependent claims and the accompanying drawings.

  The foregoing and further objects, features and advantages of the present invention will be understood by the following non-limiting detailed description of preferred embodiments of the invention, illustrated below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a sealing structure according to an embodiment of the present invention. FIG. 2 is a schematic view of a sealing structure according to an embodiment of the present invention. FIG. 3 is a schematic diagram corresponding to FIG. 2 according to one embodiment of the present invention, in which the O-ring is replaced. FIG. 4 is a schematic diagram corresponding to FIG. 2 according to an embodiment of the present invention, in which the sealing band is exchanged.

  FIG. 1 is a schematic cross-sectional view of a pressure vessel 1 according to an embodiment of the present invention. The pressure vessel 1 has a cylinder body 2 composed of two connected sub-cylinders 4 and 6. The cylinder body 2 is closed at both ends by lids 10, 11, which are held in place by a framework 12. The cylinder body 2 is arranged so as to hold an article to be subjected to high pressure processing.

  The outer envelope surface of the cylinder body 2 is provided with prestressing means in the form of a package of wound steel band 8. The band is tightly wound in the radial direction around the envelope surface of the cylinder body 2 so as to apply a radial compressive stress to the wall of the pressure vessel. The band has a rectangular cross-sectional shape and is wound from one end to the other end. Each turn from one end to the other creates prestress, and the entire prestressing means has several layers of wound steel bands.

  The framework 12 is also provided with a package of wound steel bands 14 to assist the framework 12 that receives an axial load. To open the pressure vessel 1, the framework 12 is moved in a direction perpendicular to the axial direction of the cylinder body 2, whereby the lids 10, 11 are removed to give access to the inside of the cylinder body 2. be able to.

  The two sub cylinders 4 and 6 are connected to each other in the axial direction by an attachment member 16. This attachment member 16 is held in place by radial prestressing means in the form of a package of wound steel band 8 arranged around the envelope surface of the cylinder body 2.

  A sealing structure for sealing the joint 3 between the two sub cylinders 4 and 6 is provided on the inner wall of the cylinder body 2. The sealing arrangement has a sealing band 18 which is held in place in the axial direction by the locking members 20, 21. The sealing structure is described in more detail below with reference to FIG.

  FIG. 2 is a diagram showing an enlargement of the joint 3 between the two sub-cylinders 4 and 6 according to the embodiment of the present invention. The package of the cylinder body 2 wall and the wound steel band 8 is shown in section in the area of the joint 3. The striped area indicates a cut surface.

  The two sub-cylinders 4 and 6 shown in the figure are circular parts having a circular cross section, and the thickness, outer diameter and inner diameter of the sub-cylinder are the same.

  The two sub cylinders 4 and 6 are connected in the axial direction by an attachment member 16 disposed on the outer wall of the cylinder body 2. The first seat 22 is disposed on the outer wall of the first sub-cylinder 4, and the second seat 26 is disposed on the outer wall of the second sub-cylinder 6. The attachment member 16 is engaged with the first and second seats 22 and 26 of the sub cylinders 4 and 6, and the joint 3 is symmetrically overlapped between the two sub cylinders 4 and 6. The first portion 24 of the attachment member 16 is disposed on the first seat 22 of the first sub-cylinder 4, and the second portion 28 of the attachment member 16 is disposed on the second sub-cylinder 6. The second sheet 26 is arranged. The attachment member has two segments formed in an arc shape, and extends to the periphery around the cylinder body 2 when engaged with the seats 22 and 26.

  The attachment member 16 is embedded in the wall of the cylinder body 2 so that the outer surface of the cylinder body 2 having two sub-cylinders connected to each other is in the same plane. The first sheet 22 is embedded in the first sub-cylinder 4, and the second sheet 26 is embedded in the second sub-cylinder 28. As a result, the attachment member 16 is moved to the sheets 22, 26. In addition, the radially outermost surface of the attachment member is parallel to the radially outermost surface of the two connected sub-cylinders. Thereby, stress concentration is avoided and the compressive stress exerted by the prestressing means is evenly distributed.

  The pressure vessel 1 is provided with a sealing structure disposed on the inner wall of the cylinder body 2 and seals the joint 3 between the two sub-cylinders 4 and 6. The sealing structure has a sealing band 18, locking rings 20, 21, O-rings 33, 34, 35, 36, projecting flanges 30, 32, spacers 38, 39, and a mounting space 39.

  The sealing band 18 is made of bronze, and the spacers 38 and 39 are made of a plastic material. The locking rings 20 and 21 are circlips.

  The sealing band 18 is prestressed in the radial direction in contact with the first and second projecting flanges 30 and 32, and between the first and second sub-cylinders 4 and 6. The joint 3 is concentrically positioned on the first and second projecting flanges 30 and 32 so as to be sealed.

  In order to further seal the axial connection between the two sub-cylinders 4, 6, an auxiliary sealing arrangement is provided. The peripheral portion of the sealing band 18 extends axially through the projecting flanges 30, 32 so that a sealing channel is formed under both projecting flanges 30, 32. The sealing channel is formed between the axially extending portion of the sealing band, the radial surfaces of the projecting flanges 30 and 32, and the inner walls of the sub cylinders 4 and 6. Each sealing channel is provided with two O-rings 33, 34, 35, 36 and spacers 38, 39. Between the two adjacent O-rings 33, 34 or 35, 36, grease is provided to act as a corrosion inhibitor. The spacers 38, 39 are mounted to function as obstacles and prevent the O-rings 33, 34, 35, 36 from exiting the sealing channel.

  The sealing band 18 is axially held in place by locking members 20, 21 arranged in the mounting spaces 51, 52 on both sides of the sealing band 18. The dimensions of the locking members 20 and 21 are set so as to engage the mounting spaces 51 and 52 in the axial direction.

  The inner surface of the cylinder body 2 is arranged so as to be in the same plane as the installed sealing structure so that the arrangement and shape inside the cylinder body 2 are not affected by the sealing structure.

  The mounting spaces 51, 52 are at the periphery and are arranged to facilitate replacement of the components of the sealing structure. The dimensions of the mounting spaces 51, 52 are sufficient to provide access to the O-rings 33, 34, 35, 36 when the adjacent locking rings 20, 21 and spacers 38, 39 are removed. On the other hand, the sealing band 18 is in its mounting position. The O-ring 33 in the exchange process is shown in FIG. The upper locking member 20 moves out of the pressure vessel, thereby making the outermost O-ring 33 accessible. Even the innermost O-ring 34 is accessible and can be exchanged via the mounting space 51. For example, two new O-rings and grease can be placed in the sealing channel. The surface of the sealing channel, in particular the sub-cylinders 4, 6 can be further inspected via the mounting spaces 51, 52.

  The present invention further includes a method for replacing a worn sealing band. One example of the exchange process is shown in FIG. A tool 50 having a wedge-shaped surface is inserted into the first mounting space 51 so that the wedge-shaped surface is the innermost radial direction of the bottom of the first mounting space 51 and the first projecting flange 30. A sliding surface is formed in the axial direction along the length between the two ends and in the radial direction along the peripheral edge portion of the mounting space 51.

  A new sealing band 18 is introduced into the oval shaped pressure vessel 1. The sealing band 18 is placed in the mounting space 51 and deformed so as to return to its original circular shape.

  FIG. 4 shows the sealing band 18 in the process of pressing the sealing band 18 on the wedge-shaped surface of the tool 50 concentrically within the first and second projecting flanges 30, 32 into the sealing position. The sealing band 18 is provided with a chamfered edge 40 along which the sealing band 18 slides relative to the tool 50. The pressure of the sealing band 18 is such that when the sealing band 18 comes into contact with the projecting flanges 30, 32, the sealing band 18 from the state where the original stress is not applied when the mounting band is in a radially compressed state. Implying compression. The new exchanged sealing band 18 overlaps to seal the joint 3 between the two sub-cylinders 4, 6 when moved to lie on top of the protruding flanges 30, 32.

  In FIG. 4, both locking members 20, 21 are removed so as to come out of the cylinder body 2, but in order to facilitate replacement of the sealing band 18, only one of the locking members 20, 21 is attached to the mounting spaces 51, 52. Needs to be removed from. The new O-rings 33, 34, 35, 26 and spacers 38, 40 are preferably mounted such that a new sealing band is mounted.

  The pressure vessel 1 of FIGS. 1 to 4 further includes a radial discharge channel 44 disposed at the interface between the joints of the first and second sub-cylinders, a discharge hole 42 disposed in the attachment member, and a cylinder. It has a discharge structure having a rod 46 arranged between the envelope surfaces of the main body 2 and prestressing means 8 which are formed in the discharge channel in the radial direction.

  The attachment member 16 has a through-discharge hole with an inlet at the joint 3 between the first sub-cylinder 4 and the second sub-cylinder 6 that extends radially through the attachment member 16. 42 is provided. Such through discharge holes 42 are arranged at frequent intervals around the periphery of the attachment member 16, see FIG.

  The joint 3 between the two sub-cylinders 4, 6 is connected to the inlet of the through-discharge hole 42 of the attachment member 16 from the sealing structure 18 inside the cylinder body 2 through the cylinder body 2 in the radial direction. A radially extending discharge channel 44 is provided which extends up to.

  Six edged rods 46 are arranged around the outer envelope surface of the cylinder body 2 between the cylinder body 2 and the prestressing means. The rod 46 is placed side to side around the cylinder body 2 after the prestressing means is applied. An axially extending channel is formed between each pair of adjacent rods and the surface of the cylinder body 2 so that the discharge channel extends along the envelope surface in the axial direction of the cylinder body 2. Formed.

  Ideally, no leakage from the pressure vessel 1 to the outside occurs. However, if a leak occurs at the sealing means, the pressure medium flows out of the cylinder body 2.

  The leakage flow is routed through the sealing means, first through the radially extending discharge channel 44 and then through the through discharge hole 42 and finally to the axially extending discharge channel. Flowing. The diameter or cross-sectional area of the leakage flow path is arranged so that the flow follows a path of equal or expanding diameter or cross-sectional area. Thereby, the pressure medium leaking through the joint 3 flows with a low flow resistance and the separating force acting on the sub-cylinder is reduced. This discharge arrangement makes it possible to notice leaks at an early stage. Depending on the cross-sectional shape, the size of the cross-sectional area can be further adjusted to achieve the desired result of low flow resistance.

Claims (17)

At least a first sub-cylinder and a second sub-cylinder connected to each other in an axial direction to form a cylinder body for containing a high-pressure medium;
A sealing structure disposed on an inner wall of the cylinder body for sealing a joint between the first sub-cylinder and the second sub-cylinder against leakage of the high-pressure medium;
The sealing structure is:
A ring-shaped sealing band;
A projecting flange at a first peripheral edge disposed in contact with an inner wall of the first sub-cylinder and extending in an axial direction from the joint so as to be separated from the second sub-cylinder;
A second peripheral projecting flange disposed in contact with the inner wall of the second sub-cylinder and extending in an axial direction away from the first sub-cylinder from the joint;
The sealing band is in contact with the first and second projecting flanges so as to be prestressed in the radial direction at the mounting position, and the first sub-cylinder and the second sub-cylinder Positioned concentrically within the first and second projecting flanges so as to overlap to seal the joint between
The sealing structure is further disposed on the inner wall of the first sub-cylinder to facilitate replacement of components of the sealing structure and from the first projecting flange to the second A pressure vessel for a high-pressure press having a first peripheral mounting space extending in the axial direction so as to be separated from the sub-cylinder.   The sealing band is prestressed in the radial direction by being elastically compressed at the mounting position, and the contact pressure between the sealing band and the protruding flange is at least 2 MPa, 2. The pressure vessel for a high-pressure press according to claim 1, wherein both protruding flanges protrude in a radial direction by a predetermined radial length, and the sealing band has a predetermined outer diameter in a state where no stress is applied. The protruding sealing flanges each have a peripheral, sealing contact surface for sealing contact with a corresponding sealing surface of the sealing band;
The pressure vessel for a high-pressure press according to claim 1 or 2, wherein the contact surface extends in the axial direction in parallel with a central axis of the cylinder body.   The pressure vessel for a high pressure press according to any one of claims 1 to 3, wherein the sealing band is provided with a chamfered edge portion along at least one of its peripheral edges.   The pressure vessel for a high pressure press according to any one of claims 1 to 4, wherein the sealing band is made of a metal material, preferably a bronze material.   The first mounting space is dimensioned so that when the sealing band is positioned in the first mounting space in a pre-mounted position, the sealing band is preferably not substantially stressed. 6. The method according to any one of claims 1 to 5. The sealing band is a mounting position, and a peripheral sealing channel is formed between the sealing band, a radial surface of the first projecting flange, and an inner wall of the first sub-cylinder. A peripheral portion extending through the first projecting flange and extending axially over a portion of the first mounting space;
The sealing arrangement further comprises a peripheral auxiliary sealing arrangement, the auxiliary sealing arrangement for sealing the joint between the sealing band and the first protruding flange. The pressure vessel for high pressure press according to any one of claims 1 to 6, which is disposed in the sealing channel.   8. The high pressure press of claim 7, wherein the first mounting space has an axial extension that accesses the sealing channel from within the cylinder body for replacement of at least components of the auxiliary sealing structure. Pressure vessel.   The pressure vessel for a high-pressure press according to claim 7 or 8, wherein the auxiliary sealing structure is a soft seal.   10. The high pressure press unit according to claim 1, wherein the sealing structure further includes a locking member disposed in the first mounting space in order to prevent axial movement of the sealing band in a mounting position. Pressure vessel. The first mounting space is formed by a peripheral mounting groove on the inner wall of the first sub-cylinder, and the thickness of the locking member in the radial direction is the combined diameter of the first projecting flange and the sealing band. Equal to the thickness in the direction,
The locking member extends in the axial direction from the periphery of the sealing band to the tip of the mounting groove, whereby the inner surface in the radial direction of the sealing band, the inner surface of the cylinder body outside the locking member and the mounting groove Are pressure vessels for high-pressure presses according to claim 10.   The pressure vessel for high pressure press according to claim 10 or 11, wherein the locking member has a circlip.   The sealing structure further has a second peripheral mounting space, and the second peripheral mounting space is disposed on an inner wall of the second sub-cylinder, Axially extending away from the first sub-cylinder, arranged as a mounting space on the first peripheral edge, and cooperating with corresponding features of the sealing structure such as the mounting space on the first peripheral edge. The pressure vessel for a high-pressure press according to any one of claims 1 to 12.   14. The pressure vessel for a high pressure press according to claim 13, wherein the sealing structure is symmetrical with respect to the joint between the first sub-cylinder and the second sub-cylinder.   15. The pressure vessel according to claim 1, further comprising prestressing means provided around an envelope surface of the cylinder body so that the cylinder body is prestressed in the radial direction. container. The first sub-cylinder and the second sub-cylinder are connected in an axial direction by an attachment member,
The first sub-cylinder is provided with a first sheet that receives a first portion of the attachment member,
The second sub-cylinder is provided with a second sheet that receives the second portion of the attachment member,
The attachment member is engaged with the first and second seats;
The attachment member and the first and second seats are the attachment member and the first and second seats between the first sub-cylinder and the second sub-cylinder. Arranged to work together to prevent relative axial movement of
The prestressing means is configured so that the cylinder body is prestressed in the radial direction, and the attachment member is locked to the first and second seats. The pressure vessel for a high-pressure press according to claim 15 provided around. A method for replacing a worn sealing band of a pressure vessel according to claim 1,
Removing the worn sealing band from the pressure vessel;
A tool having a wedge-shaped surface is inserted into the first mounting space so that the wedge-shaped surface is the innermost radial end of the bottom of the first mounting space and the first projecting flange. Inserting a tool having a wedge-shaped surface into the first mounting space so as to form a sliding surface in the axial direction at least at a selected peripheral portion at least along the length between the first portion and the second portion. When,
Transforming the circular replacement sealing band into an oval shape;
Incorporating the modified replacement sealing band into the pressure vessel;
Placing the modified replacement sealing band in the first mounting space;
Deforming the deformed replacement sealing band so as to return the deformed replacement sealing band to the original circular shape in the first mounting space;
The replacement sealing band is in contact with the first and second projecting flanges so as to be prestressed in a radial direction, and the first sub-cylinder and the second sub-cylinder The replacement sealing band on the wedge-shaped surface of the tool is concentrically pressed into the sealing position within the first and second projecting flanges so as to overlap to seal the joint between A method comprising the steps.

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